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Estimating abundance with interruptions in data collection using open population spatial capture-recapture models

Published on Jun 14, 2019in bioRxiv
· DOI :10.1101/671461
Cyril Milleret4
Estimated H-index: 4
(NMBU: Norwegian University of Life Sciences),
Pierre Dupont1
Estimated H-index: 1
(NMBU: Norwegian University of Life Sciences)
+ 5 AuthorsRichard Bischof19
Estimated H-index: 19
(NMBU: Norwegian University of Life Sciences)
Abstract
The estimation of population size remains one of the primary goals and challenges in ecology and provides a basis for debate and policy in wildlife management. Despite the development of efficient non-invasive sampling methods and robust statistical tools to estimate abundance, maintenance of field sampling is still subject to economic and logistic constraints. These can result in intentional or unintentional interruptions in sampling and cause gaps in data time series, posing a challenge to abundance estimation, and ultimately conservation and management decisions. We applied an open population spatial capture-recapture (OPSCR) model to simulations and a real case study to test the reliability of abundance inferences models to interruption in data collection. Using individual detections occurring over consecutive sampling occasions, OPSCR models allow the estimation of abundance from individual detection data while accounting for lack of demographic and geographic closure between occasions. First, we simulated sampling data with interruptions in field sampling of different lengths and timing. We checked the performance of an OPSCR model in deriving abundance for species with slow and intermediate life history strategies. Finally, we introduced artificial sampling interruptions of various magnitudes and timing to a five-year non-invasive monitoring data set of wolverines (Gulo gulo) in Norway and quantified the consequences for OPSCR model predictions. Inferences from OPSCR models were reliable even with temporal interruptions in monitoring. Interruption did not cause any systematic bias, but increased uncertainty. Interruptions occurring at occasions towards the beginning and the end of the sampling caused higher uncertainty. The loss in precision was more severe for species with a faster life history strategy. We provide a reliable framework to estimate abundance even in the presence of sampling interruptions. OPSCR allows monitoring studies to provide contiguous abundance estimates to managers, stakeholders, and policy makers even when data are non-contiguous. OPSCR models do not only help cope with unintentional interruptions during sampling but also offer opportunities for using intentional sampling interruptions during the design of cost-effective population surveys.
  • References (36)
  • Citations (0)
References36
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#2Ben C. Augustine (Cornell University)H-Index: 1
Last.Chris Sutherland (UMass: University of Massachusetts Amherst)H-Index: 11
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#1Cyril Milleret (NMBU: Norwegian University of Life Sciences)H-Index: 4
#2Pierre Dupont (NMBU: Norwegian University of Life Sciences)H-Index: 1
Last.Richard Bischof (NMBU: Norwegian University of Life Sciences)H-Index: 19
view all 7 authors...
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#1Cyril Milleret (NMBU: Norwegian University of Life Sciences)H-Index: 4
#2Pierre Dupont (NMBU: Norwegian University of Life Sciences)H-Index: 1
Last.Richard Bischof (NMBU: Norwegian University of Life Sciences)H-Index: 19
view all 6 authors...
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#2Perry de Valpine (University of California, Berkeley)H-Index: 21
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